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/* _PDCLIB_increment_overflow( int *, int )
This file is part of the Public Domain C Library (PDCLib).
Permission is granted to use, modify, and / or redistribute at will.
*/
#ifndef REGTEST
#include "pdclib/_PDCLIB_tzcode.h"
/* Normalize logic courtesy Paul Eggert. */
bool _PDCLIB_increment_overflow( int * ip, int j )
{
int const i = *ip;
/* If i >= 0 there can only be overflow if i + j > INT_MAX
or if j > INT_MAX - i; given i >= 0, INT_MAX - i cannot overflow.
If i < 0 there can only be overflow if i + j < INT_MIN
or if j < INT_MIN - i; given i < 0, INT_MIN - i cannot overflow.
*/
if ( ( i >= 0 ) ? ( j > _PDCLIB_INT_MAX - i ) : ( j < _PDCLIB_INT_MIN - i ) )
{
return true;
}
*ip += j;
return false;
}
#endif
#ifdef TEST
#include "_PDCLIB_test.h"
int main( void )
{
#ifndef REGTEST
#endif
return TEST_RESULTS;
}
#endif
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